Guys I'm running GIMP 2.8.18 and I recently had the same problem and I did all the above.
-installed Ghostscript
-copied the patch(gsdll32.dll) over to the bin folder in gimp. renamed it but that didn't work
The following did for me.
I checked around and found that installing the dll file from a previous version of Gimp does the trick
I still have Ghostscript installed
I downloaded the dll ((gsdll32.dll) file from GIMP 2.8.10 (32 bit)
(ensure gimp is closed)
1st rename the dll file in C:\Program Files\GIMP 2\bin\libgs-8.dll
to libgs-8.dll.backup
2nd copy the downloaded dll (that was downloaded) and paste it in the same folder bin folder.
restart Gimp that should work. re-open the .eps file.
